<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>bootstrap</title>
	<meta name="viewport" content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
	<link href="https://cdn.bootcss.com/bootstrap/3.3.2/css/bootstrap.min.css" rel="stylesheet">
	<link rel="stylesheet" href="static/css/index.css">
	<script src="https://cdn.bootcss.com/jquery/3.3.1/jquery.js"></script>
	<script src="https://cdn.bootcss.com/bootstrap/3.3.2/js/bootstrap.min.js"></script>
	<script src="static/js/index.js"></script>
</head>
<body>
	<nav class="navbar navbar-default">
		<div class="container-fluid">
			<div class="navbar-header">
				<button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#bs-example-navbar-collapse-1" aria-expanded="false">
					<span class="sr-only">Toggle navigation</span>
					<span class="icon-bar"></span>
					<span class="icon-bar"></span>
					<span class="icon-bar"></span>
				</button>
				<a href="#" class="navbar-brand">Brand</a>
			</div>
			<div class="collapse navbar-collapse" id="bs-example-navbar-collapse-1" >
				<ul class="nav navbar-nav">
					<li><a href="#">首页</a></li>
					<li><a href="#">第二页</a></li>
					<li><a href="#">第三页</a></li>
					<li><a href="#">第四页</a></li>
					<li><a href="#">第五页bug</a></li>
					<li class="dropdown">
						<a href="#" class="dropdown-toggle" ></a>
					</li>
				</ul>
			</div>
		</div>
	</nav>	
</body>
</html>